/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.text.java;

import org.eclipse.che.jdt.util.JdtFlags;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.jdt.core.formatter.CodeFormatter;
import org.eclipse.jdt.internal.corext.codemanipulation.CodeGenerationSettings;
import org.eclipse.jdt.internal.corext.codemanipulation.GetterSetterUtil;
import org.eclipse.jdt.internal.corext.util.CodeFormatterUtil;
import org.eclipse.jdt.internal.corext.util.Messages;
import org.eclipse.jdt.internal.corext.util.Strings;
import org.eclipse.jdt.internal.ui.JavaPluginImages;
import org.eclipse.jdt.internal.ui.JavaPreferencesSettings;
import org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.che.jface.text.contentassist.ICompletionProposalExtension4;
import org.eclipse.jface.viewers.StyledString;

import java.util.Collection;
import java.util.Set;

public class GetterSetterCompletionProposal extends JavaTypeCompletionProposal implements ICompletionProposalExtension4 {

	public static void evaluateProposals(IType type, String prefix, int offset, int length, int relevance, Set<String> suggestedMethods, Collection<IJavaCompletionProposal> result) throws

                                                                                                                                                                                     CoreException {
		if (prefix.length() == 0) {
			relevance--;
		}

		IField[] fields= type.getFields();
		IMethod[] methods= type.getMethods();
		for (int i= 0; i < fields.length; i++) {
			IField curr= fields[i];
			if (!JdtFlags.isEnum(curr)) {
				String getterName= GetterSetterUtil.getGetterName(curr, null);
				if (Strings.startsWithIgnoreCase(getterName, prefix) && !hasMethod(methods, getterName)) {
					suggestedMethods.add(getterName);
					int getterRelevance= relevance;
					if (JdtFlags.isStatic(curr) && JdtFlags.isFinal(curr))
						getterRelevance= relevance - 1;
					result.add(new GetterSetterCompletionProposal(curr, offset, length, true, getterRelevance));
				}

				if (!JdtFlags.isFinal(curr)) {
					String setterName= GetterSetterUtil.getSetterName(curr, null);
					if (Strings.startsWithIgnoreCase(setterName, prefix) && !hasMethod(methods, setterName)) {
						suggestedMethods.add(setterName);
						result.add(new GetterSetterCompletionProposal(curr, offset, length, false, relevance));
					}
				}
			}
		}
	}

	private static boolean hasMethod(IMethod[] methods, String name) {
		for (int i= 0; i < methods.length; i++) {
			if (methods[i].getElementName().equals(name)) {
				return true;
			}
		}
		return false;
	}

    private final IField  fField;
    private final boolean fIsGetter;

    public GetterSetterCompletionProposal(IField field, int start, int length, boolean isGetter, int relevance) throws JavaModelException {
        super("", field.getCompilationUnit(), start, length, JavaPluginImages.get(JavaPluginImages.DESC_MISC_PUBLIC),
              getDisplayName(field, isGetter), relevance); //$NON-NLS-1$
        Assert.isNotNull(field);

        fField = field;
        fIsGetter = isGetter;
        setProposalInfo(new ProposalInfo(field));
    }

    private static StyledString getDisplayName(IField field, boolean isGetter) throws JavaModelException {
        StyledString buf = new StyledString();
        String fieldTypeName = Signature.toString(field.getTypeSignature());
        String fieldNameLabel = BasicElementLabels.getJavaElementName(field.getElementName());
        if (isGetter) {
            buf.append(BasicElementLabels
                               .getJavaElementName(GetterSetterUtil.getGetterName(field, null) + "() : " + fieldTypeName)); //$NON-NLS-1$
            buf.append(" - ", StyledString.QUALIFIER_STYLER); //$NON-NLS-1$
            buf.append(Messages.format(JavaTextMessages.GetterSetterCompletionProposal_getter_label, fieldNameLabel),
                       StyledString.QUALIFIER_STYLER);
        } else {
            buf.append(BasicElementLabels.getJavaElementName(
                    GetterSetterUtil.getSetterName(field, null) + '(' + fieldTypeName + ") : void")); //$NON-NLS-1$
            buf.append(" - ", StyledString.QUALIFIER_STYLER); //$NON-NLS-1$
            buf.append(Messages.format(JavaTextMessages.GetterSetterCompletionProposal_setter_label, fieldNameLabel),
                       StyledString.QUALIFIER_STYLER);
        }
        return buf;
    }

    /* (non-Javadoc)
     * @see JavaTypeCompletionProposal#updateReplacementString(IDocument, char, int, ImportRewrite)
     */
    @Override
    protected boolean updateReplacementString(IDocument document, char trigger, int offset, ImportRewrite impRewrite)
            throws CoreException, BadLocationException {

        CodeGenerationSettings settings = JavaPreferencesSettings.getCodeGenerationSettings(fField.getJavaProject());
        boolean addComments = settings.createComments;
        int flags = Flags.AccPublic | (fField.getFlags() & Flags.AccStatic);

        String stub;
        if (fIsGetter) {
            String getterName = GetterSetterUtil.getGetterName(fField, null);
            stub = GetterSetterUtil.getGetterStub(fField, getterName, addComments, flags);
        } else {
            String setterName = GetterSetterUtil.getSetterName(fField, null);
            stub = GetterSetterUtil.getSetterStub(fField, setterName, addComments, flags);
        }

        // use the code formatter
        String lineDelim = TextUtilities.getDefaultLineDelimiter(document);

        IRegion region = document.getLineInformationOfOffset(getReplacementOffset());
        int lineStart = region.getOffset();
        int indent = Strings.computeIndentUnits(document.get(lineStart, getReplacementOffset() - lineStart), settings.tabWidth,
                                                settings.indentWidth);

        String replacement =
                CodeFormatterUtil.format(CodeFormatter.K_CLASS_BODY_DECLARATIONS, stub, indent, lineDelim, fField.getJavaProject());

        if (replacement.endsWith(lineDelim)) {
            replacement = replacement.substring(0, replacement.length() - lineDelim.length());
        }

        setReplacementString(Strings.trimLeadingTabsAndSpaces(replacement));
        return true;
    }

    /*
     * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension4#isAutoInsertable()
     */
    public boolean isAutoInsertable() {
        return false;
    }
}

